using other people's video in my video..?

[Flintstone]

Let's say I want to do a 20 minute 'documentary' on the super mario brothers speedrun progression.

Can I be "the host", and talk about all kinds of stuff, but show video of other videos that are already on youtube? I see it all the time, but I'm just wondering how that works I guess.

I'd -feel- like I'd want to ask them first, but do I -have- to?

Let's say my video gets a billion views, now do I have a problem?

Thanks

 

[Crown]

Moved to the copyright / claims / legal forum.

but do I -have- to?

Yes, you must ask for permission. If they don't reply or if they say, no, then don't use their content.

Let's say my video gets a billion views, now do I have a problem?

Without permission, you have a problem even with 0 views.

 

[Cephus]

No, you can't "host" someone else's content without permission. Make your own content, stop stealing from others.